Tympan for printing-presses.



UNITED S AT S PATENT OFFidii.

ARTHUR SAMUEL ALLEN, OF BOSTON, MASSACHUSETTS.

i'YMeAN' Foe PRINTING-'PRIESSESI.

. SPECIFICATION forming part of Letters Patent in). 629,183, dated July 18, reed Application filed-March 3,1395. Serial No. 7075605. ea model.)

To all 1672,0172 it may concern/.-

Be it known that I, ARTHUR SAMUEL AL- LEN,Of Boston,county of Suffolk,State ofiMassachusetts, have invented an Improvement in 5 Tympans for Printing-Presses, of which the following description, in connection with the accompanying drawings, is a specification, like letters on thedrawings representing like parts. i o This invention has for its object to provide an improved tympau-surface for use in printing-presses of the rotary or other usnaltype.

United States Patent No. 613,219, dated Octber25, 1898, shows a support or bed composed of wire and a bracing, and said patent describes that a leveling-sheet may be laid on said bed. In the use of said bed I find that great advantage arisesby the employment on said leveling-sheet of a facing o of India-rubber, and said facing by being scored finely to leave a series of short proj ections adds very materiallyto its utility.

One point of my invention, therefore, consists in a tympan for use in printing-presses, 5 it presentinga hard leveling-sheet having applied to its face alayer of indie-rubber or equivalent elastic material. Other features ofmyinvention will be hereinafter pointed out in the claims at the end ,0 of this specification. I

Figure l in plan view shows a support or bed of the kind represented in said patent with my improvements added, various layers of material, to be hereinafter described, being .5 broken out to enable the construction of the apparatus to be understood. Fig. 2 is a section of Fig. 1 in the dotted line :20, the figure I I being broken out centrally. Fig. 3 shows the leveling-sheet and india-rubber layer deb tached from the bed or support containing the yielding wire.

The wire a, herein represented isinthe form of coils and laid side by side and interlocked, 'the'bracing b applied to said wire and entering .5 the interstices left between separate turns or bends thereof, and the leveling-sheet c is and may be substantially such as shownin said patent; but this invention is not limited to the exact construction shown for the wire and 5e bracing constituting the support or bed, and

preferably will be of fiber-board, celluloid, or I any equivalent, substance, it being a hard and strong material which, laid on the support described, may yield somewhat to the necessities of the type or printing surface.

By the use of my invention I do away substantially with the step of making ready, and in the use of the support and leveling-sheet I find when printing from cuts that I. gain superior results by the addition to the leveling-sheet'oi' a thin layer ofindia-rubber, as d, and [also find that it is of material advantage to score the face of the said layer of in dia-rubber, as shown in Fig. 1..

I may and preferably shall apply to the india-rubber a'face-sheet c, of paper or other usual material employed for the face of the tympan. I

, Referring to Fig. 1, it shows the paper or active face partially broken out to disclose the layer of scored india-rubber below it, and 7 5 the scored'india-rubber is broken away to represent the leveling-sheet which sustains it and with which it is preferablyconnected, and said leveling-sheet is in turn broken away to show the support or bed below it composed of the'bracing and wire, and part of the brac- Y ing is removed to disclose the wire. I

By the term india-rubber I mean to cover not only india-rubber, but any other equivalent elastic material.

Having described my invention, what I claim as new, and desire to secure by Letters Patent, is-

1. In a tympan for usein printing-presses, a hard flat leveling-sheet having applied to its face a layer of, india-rubber or equivalent elastic material, substantially as described.

2. In a tympan for use in printing-presses, a hard leveling-sheet having applied to its face a layer of indie-rubber or equivalent 5 elastic material, said india-rubber or equivalent elastic material being scored to present a series of projections, substantially asdee' scribed. V

3. A support or bed composed of wire, com- I00 bined With a leveling-sheet and a superini- In testimony whereof I have signed my posed layer of indie-rubber, substantially as name to this specification in the presence of 1 described. 1 two subscribing Witnesses.

4. Asupport or bed composed of Wire, and ARTHUR SAMUFL ALLEN 5 a, bracing applied to said Wire to retainit in position, combined with EL leveling-sheet and Vitnesses: a superimposed sheet of indie-rubber, sub- GEO. \V. GREGORY, stantially as described. MARGARET A. DUNN. 

